Aiming at the characteristic of the dependency between the application components and the application server platform, a rejuvenation strategy with two different levels of rejuvenation granularities is put forward in ...Aiming at the characteristic of the dependency between the application components and the application server platform, a rejuvenation strategy with two different levels of rejuvenation granularities is put forward in this paper including the application component reiuvenation and the application server system rejuvenation. The availability and maintenance cost functions are obtained by means of establishing the application server aging model and the boundary condition of the optimal rejuvenation time is analyzed. Theory analysis indicates that the two-level rejuvenation strategy is superior to the traditional single level one. Finally, evaluation experiments are carried out and numerical result shows that compared with the traditional rejuvenation policy, the rejuvenation strategy proposed in this paper can further increase availability of the application server and reduce maintenance cost.展开更多
After analyzing the features of the Parlay application server（AS）, which provides many services with different time constraints in the next generation network（NGN）, a selfadapted overload control algorithm impleme...After analyzing the features of the Parlay application server（AS）, which provides many services with different time constraints in the next generation network（NGN）, a selfadapted overload control algorithm implemented in Parlay AS is proposed. In this algorithm, the service process module in parlay AS uses the earliest deadline first （EDF） serving rule to serve messages, and the overload control mechanism, using the Leaky Bucket algorithm to control message flows, is triggered by estimating the queue waiting time of a newly arriving message. By simulation it shows that this algorithm is a simple, easy-to-use, and available algorithm.展开更多
A new load balancing algorithm named dynamic weighed random （DWR） algorithm for the session initiation protocol （SIP） application server cluster is proposed. It uses weighted hashing random algorithm that supports...A new load balancing algorithm named dynamic weighed random （DWR） algorithm for the session initiation protocol （SIP） application server cluster is proposed. It uses weighted hashing random algorithm that supports dialog in the SIP protocol to distribute messages. The weight of each server is dynamic adaptive with feedback mechanism. DWR insures that the cluster is balanced, and it performs better than the limited resource vector （LRV） algorithm and minimum sessions first （MSF） algorithm.展开更多
The explosive growth of the Internet has caused the new medium to step past just being another means of communication, and has acted as a catalyst to cause radical changes to the nature of business. Amongst the change...The explosive growth of the Internet has caused the new medium to step past just being another means of communication, and has acted as a catalyst to cause radical changes to the nature of business. Amongst the changes, e Business, which brings internet technology to all areas of work in enterprises, is especially active. Many enterprises are showing strong interest the application server adapted internet technology, such as Web and Java, as the new platform for the next generation in enterprise computing environments. INTERSTAGE builds on the latest internet technology, and is a complete software platform centering on application server, which can support the various business applications required for e Business. In this document we cover the overview of features and functions of INTERSTAGE, and introduce Fujitsu's approach to e Business through INTERSTAGE.展开更多
基金Supported by the National Natural Foundation ofChina (60473098) IBMChina Research Lab Joint Project
文摘Aiming at the characteristic of the dependency between the application components and the application server platform, a rejuvenation strategy with two different levels of rejuvenation granularities is put forward in this paper including the application component reiuvenation and the application server system rejuvenation. The availability and maintenance cost functions are obtained by means of establishing the application server aging model and the boundary condition of the optimal rejuvenation time is analyzed. Theory analysis indicates that the two-level rejuvenation strategy is superior to the traditional single level one. Finally, evaluation experiments are carried out and numerical result shows that compared with the traditional rejuvenation policy, the rejuvenation strategy proposed in this paper can further increase availability of the application server and reduce maintenance cost.
基金the National Natural Science Foundation of China（60703094）.
文摘After analyzing the features of the Parlay application server（AS）, which provides many services with different time constraints in the next generation network（NGN）, a selfadapted overload control algorithm implemented in Parlay AS is proposed. In this algorithm, the service process module in parlay AS uses the earliest deadline first （EDF） serving rule to serve messages, and the overload control mechanism, using the Leaky Bucket algorithm to control message flows, is triggered by estimating the queue waiting time of a newly arriving message. By simulation it shows that this algorithm is a simple, easy-to-use, and available algorithm.
基金supported by the National Science Fund for Distinguished Young Scholars (60525110)the National Basic Research Program of China (2007CB307100, 2007CB307103)Development Fund Project for Electronic and Information Industry
文摘A new load balancing algorithm named dynamic weighed random （DWR） algorithm for the session initiation protocol （SIP） application server cluster is proposed. It uses weighted hashing random algorithm that supports dialog in the SIP protocol to distribute messages. The weight of each server is dynamic adaptive with feedback mechanism. DWR insures that the cluster is balanced, and it performs better than the limited resource vector （LRV） algorithm and minimum sessions first （MSF） algorithm.
文摘The explosive growth of the Internet has caused the new medium to step past just being another means of communication, and has acted as a catalyst to cause radical changes to the nature of business. Amongst the changes, e Business, which brings internet technology to all areas of work in enterprises, is especially active. Many enterprises are showing strong interest the application server adapted internet technology, such as Web and Java, as the new platform for the next generation in enterprise computing environments. INTERSTAGE builds on the latest internet technology, and is a complete software platform centering on application server, which can support the various business applications required for e Business. In this document we cover the overview of features and functions of INTERSTAGE, and introduce Fujitsu's approach to e Business through INTERSTAGE.
